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(11) | EP 0 492 387 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Solid-state electrochromic device with proton-conduction polymer electrolyte |
| (57) A solid-state electrochromic device is disclosed comprising tungsten oxide-Prussian
blue complementary configuration in combination with a proton-conducting polymer electrolyte.
A novel proton-conducting copolymer, especially useful in transparent electrochromic
cells, comprising the reaction product of a vinyl sulfate monomer with a comonomer
selected to form an alternating copolymer, such as vinylpyrrolidone, is disclosed.
Novel transparent complementary electrode materials for electrochromic cells are disclosed,
of the general formula [M¹]₄[M²(CN)₆]₃ wherein M¹ may be indium, gallium, gadolinium,
lanthanum, and M² is iron. Unlike Prussian blue (where M¹ and M² are both iron), the
complementary electrode materials of the present invention are stable, and do not
have to be precharged. An electrochromic transparency comprising an electrochromic
film and an ion-conductive layer disposed between a pair of electrodes is disclosed
wherein the optical properties and electrochromic efficiency are improved by means
of a metal grid electrode, wherein adhesion of the metal grid to an acidic polymer
electrolyte is improved by means of a primer coating comprising a copolymer of acrylamidopropane
sulfonic acid and acrylic acid. |